Formal:
* Logophile: This term literally means "lover of words." It's a broad term, but encompasses those who enjoy wordplay.
* Lexicophile: This means "lover of dictionaries" and is more specifically focused on words themselves.
* Wordsmith: While often used to describe someone who writes well, it can also be used for someone who enjoys playing with words.
Informal:
* Word nerd: A playful term for someone who is passionate about words.
* Word puzzle enthusiast: A more specific term for someone who enjoys word games like crosswords, Scrabble, etc.
* Word game aficionado: A formal-sounding term for someone who loves word games.
Creative:
* Word wizard: This term implies a certain skill and cleverness with words.
* Verbal virtuoso: Similar to "word wizard," this implies a mastery of language.
The best term to use depends on the context and your desired level of formality.